In recent political debate, the association between national souverainisme and Euroscepticism is considered a natural one. From Marine Le Pen to Matteo Salvini, there is a unanimous affirmation of the necessity to defend national sovereignty against the threat of Brussels. But if we take a more in-depth look, we can see how European Integration has fed two different approaches to European federalism: the first began in 1951, a concrete path on which a kind of European federation was progressively built, while the second has considered the same path to be an obstacle in the attempt to move towards a possible European federation. According to the first group the process of integration has been better than nothing while, the opinion of the second is that the same process has been worse than nothing. Such Eurosceptic Federalism finds its roots in the anti-cosmopolitan federalism of the interwar debate and unifies, paradoxically, radical libertarians and convinced communitarians.